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Issue 93 fix: correctly set fd mask bit 31 to make swift happy #112

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Issue 93 fix: correctly set fd mask bit 31 to make swift happy #112

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4 changes: 2 additions & 2 deletions Sources/SystemLibrary.swift
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Original file line number Diff line number Diff line change
Expand Up @@ -114,7 +114,7 @@ struct SystemLibrary {
static func fdSet(fd: Int32, set: inout fd_set) {
let intOffset = Int(fd / 32)
let bitOffset = fd % 32
let mask = Int32(1 << bitOffset)
let mask = Int32((1 << bitOffset) * (bitOffset == 31 ? -1 : 1))
switch intOffset {
case 0: set.fds_bits.0 = set.fds_bits.0 | mask
case 1: set.fds_bits.1 = set.fds_bits.1 | mask
Expand Down Expand Up @@ -155,7 +155,7 @@ struct SystemLibrary {
static func fdIsSet(fd: Int32, set: inout fd_set) -> Bool {
let intOffset = Int(fd / 32)
let bitOffset = fd % 32
let mask = Int32(1 << bitOffset)
let mask = Int32((1 << bitOffset) * (bitOffset == 31 ? -1 : 1))
switch intOffset {
case 0: return set.fds_bits.0 & mask != 0
case 1: return set.fds_bits.1 & mask != 0
Expand Down